* {
    margin: 0;
}
html, body {
    height: 100%;
}

.push {
    height: 50px;
}

.footer{
    background-color: black;
    color: white;
    border: 1px solid #0A0A0A;
    padding-top:10px;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
    height: 50px; /* choose any height */
}